<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta content="width=device-width, initial-scale=1" name="viewport">
  <title>Document</title>
  <link rel="stylesheet" href="styles.css">
</head>
<body>
<div class="grid-container">
  <div class="header">
    <h2>Header</h2>
  </div>
  <div class="sidebar-left">
    <h2>Left Sidebar</h2>
  </div>
  <div class="main"><h2>Main Content</h2></div>
  <div class="sidebar-right">
    <h2>Right Sidebar</h2>
  </div>
  <div class="footer">
    <h2>Footer</h2>
  </div>
</div>
</body>
</html>